“…To minimize the heating effect induced by the radiation, it will be advantageous to use a sapphire substrates that have high thermal conductivity 10 3
−1 [ 45 ] and can provide a very efficient thermal bath to achieve sub‐ns quenching times. [
35,36,39 ] For
, the radiation intensity needed for optimal switching condition is
. In this case the temperature rise of the superconducting ring on a sapphire substrate of
thickness will not exceed
and can therefore be safely neglected.…”